Energy Converter
Convert between 17 energy units instantly. Enter a value, pick your units and get the result with the formula, a full conversion table and worked examples.
1 kWh in all energy units
Updates live as you type. Click a row to set it as the target unit.
| Unit | Symbol | Value |
|---|---|---|
| Electronvolt | eV | 2.24694 × 1025 |
| Erg | erg | 36,000,000,000,000 |
| Joule | J | 3,600,000 |
| Kilojoule | kJ | 3,600 |
| Megajoule | MJ | 3.6 |
| Gigajoule | GJ | 0.0036 |
| Calorie (IT) | cal | 859,845 |
| Kilocalorie (IT) | kcal | 859.845 |
| Watt hour | Wh | 1,000 |
| Kilowatt hour | kWh | 1 |
| Megawatt hour | MWh | 0.001 |
| Foot pound force | ft·lbf | 2,655,220 |
| British thermal unit (IT) | BTU | 3,412.14 |
| Therm (US) | thm | 0.0341296 |
| Horsepower hour | hp·h | 1.34102 |
| Ton of TNT | tTNT | 0.000860421 |
| Tonne of oil equivalent | toe | 0.0000859845 |
How to Convert Energy Units
Energy is the capacity to do work. The SI unit is the joule (J); electrical energy is billed in kilowatt hours, and heat is often quoted in BTU or kilocalories (International Table definitions used here).
Every unit on this page is stored as a fixed factor relative to one reference unit, the joule (J). Converting is a two step multiply and divide:
- Multiply your value by the factor of the source unit to get the value in J.
- Divide that result by the factor of the target unit.
Kilowatt hour to Megajoule conversion table
| Kilowatt hour (kWh) | Megajoule (MJ) |
|---|---|
| 1 kWh | 3.6 MJ |
| 2 kWh | 7.2 MJ |
| 3 kWh | 10.8 MJ |
| 4 kWh | 14.4 MJ |
| 5 kWh | 18 MJ |
| 6 kWh | 21.6 MJ |
| 7 kWh | 25.2 MJ |
| 8 kWh | 28.8 MJ |
| 9 kWh | 32.4 MJ |
| 10 kWh | 36 MJ |
| 15 kWh | 54 MJ |
| 20 kWh | 72 MJ |
| 25 kWh | 90 MJ |
| 30 kWh | 108 MJ |
| 40 kWh | 144 MJ |
| 50 kWh | 180 MJ |
| 75 kWh | 270 MJ |
| 100 kWh | 360 MJ |
| 250 kWh | 900 MJ |
| 500 kWh | 1,800 MJ |
| 1,000 kWh | 3,600 MJ |
Energy Units and Conversion Factors
Value of one unit expressed in J.
| Unit | Symbol | In J |
|---|---|---|
| Electronvolt | eV | 1.602176634 × 10−19 |
| Erg | erg | 1 × 10−7 |
| Joule | J | 1 |
| Kilojoule | kJ | 1,000 |
| Megajoule | MJ | 1,000,000 |
| Gigajoule | GJ | 1,000,000,000 |
| Calorie (IT) | cal | 4.1868 |
| Kilocalorie (IT) | kcal | 4,186.8 |
| Watt hour | Wh | 3,600 |
| Kilowatt hour | kWh | 3,600,000 |
| Megawatt hour | MWh | 3,600,000,000 |
| Foot pound force | ft·lbf | 1.355817948 |
| British thermal unit (IT) | BTU | 1,055.055853 |
| Therm (US) | thm | 105,480,400 |
| Horsepower hour | hp·h | 2,684,519.538 |
| Ton of TNT | tTNT | 4,184,000,000 |
| Tonne of oil equivalent | toe | 41,868,000,000 |
Frequently Asked Questions
What is the SI unit of energy?
The SI unit of energy is the joule (J). Energy is the capacity to do work.
How do I convert kWh to MJ?
To convert kilowatt hour (kWh) to megajoule (MJ), multiply the value in kWh by 3.6. For example, 1 kWh = 3.6 MJ.
How do I convert BTU to kJ?
To convert british thermal unit (it) (BTU) to kilojoule (kJ), multiply the value in BTU by 1.05506. For example, 1 BTU = 1.05506 kJ.
How do I convert kcal to kJ?
To convert kilocalorie (it) (kcal) to kilojoule (kJ), multiply the value in kcal by 4.1868. For example, 1 kcal = 4.1868 kJ.
Can I see a value in every energy unit at once?
Yes. Enter a value and choose the source unit; the "all units" table below the converter instantly lists the equivalent in all 17 supported units. Click any row to make it the target unit.
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